As @northoftheborder points out, radiation and surgery have similar statistical outcomes for overall survival. The nuanced, factual and well-documented statistical outcomes are readily available online should one dig deep for those numbers. My RP decision came down to pursuing the best outcome for my specific situation and I was fortunate enough to be in a position to travel to see some of the best radiation, focal-therapy and RP docs in the country before I made my decision. NOW I suspect you have not performed the quantifiable research I have because had you done so you would likely present a more balanced, pragmatic post for those coming here for a laymen's perspective. Now as for the erection issue you are laser focused on, that was a secondary factor for me on the decision tree, but even with one lost one nerve bundle I still achieve the "elusive erection" as needed. Yes it took some work post-surgery but with effort and a few months of Trimix I have zero issues in this area.